Hi, welcome on our board. 

For the right APN settings you can click here and select your phone. The prepaid unlimited bundle is quite slow though, it's a bundled designed for chatting and low traffic apps with a max. speed of 128 Kbit/s. That might explain it. 

Hi @Alex_P thanks for the help but my problem is not with the Internet is with the calls. I’m unable to call any number. What should I do?

 

That shouldn't be an issue. Would you please fill in your mobile number here? Let me know when it's done. 

Slow internet, haven't heard from you. Let me know if I can still help you with anything.